170 ENDOSPOEE^. [teichia. differs from var. u. is the membranous sporangium-waU, which is entirely free from granular deposits, and under a low magnifying power is seen to be^ embossed by the impression of the spores. This character, however, indicates so considerable a divergence from the type, that if further gatherings established its constancy this form should be marked as a distinct species. Hab. On bark and dead wood.—ft. Batheaston, Somerset (B. M. 361); a. Lyme Regis, Dorset (L:B.M.139); a. Wanstead, Essex (L:B.M.139); ft. Menmuir, Brechin, Scotland (B. M. 366); a. France (K. 997); a. Germany (K. 1771) ; a. Poland (Strassb. Herb.) ; ft. Switzerland (Strassb. Herb.); ft. Sweden (K. 1702) ; ft. Norway (Christiania Herb.) ; ft. Mass., US.A. (L:B,M.139) ; ft. Iowa (L:B.M.1.S9) ; a. Montana (L:B,M.139) ; y. on flr and birch, Norway (L:B.M.139). 8. T. erecta Rex, in Proc. Acad. Nat. Sc. Phil. (1890), p. 193. Plasmodium ? Total height 1 to 2 mm. Sporangia globose or subturbinate, stipitate or nearly sessile, scattered, 0'5 to 0'7 mm. diam., bright yeUow, mottled with weU-defined, dark brown angular patches; sporangium-waU membranous, pale yellow, densely charged 'with brown angular matter in the dark patches. Stalk cyUndrical, 0-5 to 1 mm. high, 0-2 to 0'3 mm. thick, dark brown, opaque. CapilUtium of cyUndrical bright yeUow elaters, 3'5 to 4 ^ diam., with short tapering ends; marked with four bands forming a close irregular spiral, beset with numerous spines. Spores yellow, deUcately warted, 11 to 13 p diam.—Mass., Mon., p. 184. Plate LXIL, K.—e. sporangia, x 20; /. elater, x 600; g. spore, x, 600 (United States). A single specimen of this species has been found at Lyme Regis, agreeing in every respect with the type received from Dr. Eex, except that the" stalk is very short, 0'5 mm. high. Hai). On dead wood, etc,—Lyme Eegis, Dorset (L:B.M.140 slide) ; Philadelphia (L:B.M.140). 9. T. fallax Pers,, Obs. Mye, i., p. 59 (1796). Plasmodium rose- coloured or white, in rotten wood. Total height 1'5 to 3 mm. Sporangia turbinate, stipitate, gregarious, 0'6 to 0"8 mm. diam., shining olive or yeUow-brown; sporangium-waU yeUow, mem¬ branous, of two layers. Stalk cyUndrical, furrowefl, 0-5 to 1 mm. long, olive or dark brown; hoUow, fiUed to the base with spores or spore-Uke cells. CapUlitium of cylindrical, smooth, oUve- brown elaters, 4'5 to 5'5 /a diam., marked -with four or five spiral bands, 0'5 to 1 fi broad, with intervals of 0'5 to 3 fi, graduaUy tapering into long slender points. Spores yellow-brown, minutely warted, or more or less distinctly reticulated on one side, 9 to 12 fi diam.—Rost., Mon., p. 243; Cooke, Myx. Brit., p. 61, figs. 221, 222, 233, 235; Blytt, Bidr. K. Norg., Sop. iu. (1892), p. 12 ; Macbride, in BuU. Nat. Hist. Iowa, U., p. 128; Mass., Mon., p. 192, Arcyria dedpiens Pers., in Usteri, Ann. Bot., xv., p. 35 (1795). Plate LXIL, A,—a, sporangia, x 20; J, elater, x 600; e. spores, x 60C (England) ; d. spore, reticulated on one side, spinulose on the other (United States).